# ReferenceDataSourceUpdate
<a name="API_ReferenceDataSourceUpdate"></a>

When you update a reference data source configuration for a SQL-based Kinesis Data Analytics application, this object provides all the updated values (such as the source bucket name and object key name), the in-application table name that is created, and updated mapping information that maps the data in the Amazon S3 object to the in-application reference table that is created.

## Contents
<a name="API_ReferenceDataSourceUpdate_Contents"></a>

 ** ReferenceId **   <a name="APIReference-Type-ReferenceDataSourceUpdate-ReferenceId"></a>
The ID of the reference data source that is being updated. You can use the [DescribeApplication](API_DescribeApplication.md) operation to get this value.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 50.  
Pattern: `[a-zA-Z0-9_.-]+`   
Required: Yes

 ** ReferenceSchemaUpdate **   <a name="APIReference-Type-ReferenceDataSourceUpdate-ReferenceSchemaUpdate"></a>
Describes the format of the data in the streaming source, and how each data element maps to corresponding columns created in the in-application stream.   
Type: [SourceSchema](API_SourceSchema.md) object  
Required: No

 ** S3ReferenceDataSourceUpdate **   <a name="APIReference-Type-ReferenceDataSourceUpdate-S3ReferenceDataSourceUpdate"></a>
Describes the S3 bucket name, object key name, and IAM role that Kinesis Data Analytics can assume to read the Amazon S3 object on your behalf and populate the in-application reference table.  
Type: [S3ReferenceDataSourceUpdate](API_S3ReferenceDataSourceUpdate.md) object  
Required: No

 ** TableNameUpdate **   <a name="APIReference-Type-ReferenceDataSourceUpdate-TableNameUpdate"></a>
The in-application table name that is created by this update.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 32.  
Required: No

## See Also
<a name="API_ReferenceDataSourceUpdate_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/kinesisanalyticsv2-2018-05-23/ReferenceDataSourceUpdate) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/kinesisanalyticsv2-2018-05-23/ReferenceDataSourceUpdate) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/kinesisanalyticsv2-2018-05-23/ReferenceDataSourceUpdate)